Cylinder lock



April 26, 1932. A. G.-LYONS 1,855,607

CYLINDER LOCK Filed Jan. 13, 1931 2 Sheets-Sheet l April 26, 1932. A. G.LYONS 1,855,607

CYLINDER LOCK I Filed Jan. 15, 1951 2 Sheet-Sheet 2 Patented Apr. 26,1932 ARTHUR e. LYONS, or PENNSIDE,

NEAR READING, PENNSYLVANIA, ASSIGNOR TO READING HARDWARE CORPORATION, OFREADING, PENNSYLVANIA, A. CORPORA- 'lION OF PENNSYLVANIA Applicationfiled January 13, 1931. Serial No. 508,408.

This invention relates to improvements in locks, and the primary objectis to provide means whereby the tumbler carrying portion of a cylinderlock can be readily inserted or removed for the purpose of changing thekey as in case a tenant or guest should depart and fail to remember toleave the key.

One of the objects of the invention is to provide a lock structure forthis purpose, in-

eluding auxiliary means for locking and unlocking the removable portionof the lock to the part of the lock which is to remain if the door, suchauxiliary locking means being actuated by a special key which isinserted through the same keyway as is used for the ordinary unlockingof the door.

With the. foregoing objects outlined and with other objects in viewwhich will appear as the description proceeds, the invention consists inthe novel features hereinafter de scribed, in detail, illustrated in theaccompanying drawings, and more particularly pointed out in the appendedclaims.

Referring to the drawings,

Fig. 1 is a perspective view of the two main portions of the lock, thepart on the left being the one which forms a permanent part of the door,and the one on the right being the part which is removable after it hasbeen placed in condition for removal by the use of a longer key. I

Fig. 2 is an elevation partly in vertical section, of the two lockportions in assembled position and illustrating the manner in which thespecial key can be used tooperate the auxiliary locking means that isemployed to secure I lie two sections of the lock together.

Fig. 3 is a fragmentary view similar to Fig. 2 and illustrating themanner in which a shorter or ordinary key can operate the ordinaryrollback cam of. the look without affooting the auxiliary locking means.

Fig. 1 is a perspective view of details to illustrate the manner inwhich the finger of the auxiliary locking means is mounted on andsecured to the plug of the lock.

Fig. 5 is a front elevation of the lock viewed on the arrow 5 in Fig. 2.

F ig, 6 is a similar view of the rear end of the look as viewed from thearrow 6.

Figs]; and 8 are transverse sectional views gespectively on the lines77' and 88 of Fig. 9 is a similar view on the line 99 of Fig. 3. 66 Inthe drawings, 10 designates the portion or section of the cylinder lockwhich is to remain permanently in the door. This section has on itsfront side a rotatable disk 11 which is connected by screws 12 to anordinary rollback cam 13 that is arranged on the rear face of the member10. The front face of the disk 11 has a diainetrical notch 14 to receivea diametrical ing 15 projecting from the rear face of a disk 16 that issecured by 5 screws 17 to the rotatable plug 18 of the removable sectionof the lock.

Diainetrically opposite sides of the permanent section 10 arepr'ovided'with inwardly extending ribs 19 which slidably engage di- 7oametrically opposite grooves 20 in the stationary cylinder 21 of theremovable section 22 of the lock when therear end of that section isinserted into or removed from the permanent section 10. When thecylinder 21 is inserted into the section 10, the lug 15 enters thegroove 14 so as to interlock the parts 11 and 15.

The cylinder 21 is provided with the usual spring pressed tumbler pins23 which cooperate with conventional tumbler pins 24 that project intothe keyway 25 of the rotatable plug 18. When the ordinary key 26 isemployed for unlocking purposes, it places the tumbler pins 24 and 23 insuch position as to allow the turning of the plug 18, and the lug 15 atthe rear end of'the plug cooperates with the grooves 14 so as to actuatethe rollback cam 13, as will be clear from Fig. 3.

For the purpose of securing the removable 99 section 22 to the permanentsection 10, the latter is provided with a stationary hook 27 that isadapted to project forwardly into a recess 28 in the rear end of thecylinder 21, and when in this position, the hook can be interlocked witha rocking arm 29, as best shown in Fig. 7.

When the sections of the lock are assembled, the arm 29 registers withthe recess 28 and interlocks with the hook 27, but when the arm 29 5 asleeve 30 which surrounds the rear end of the plug 18, but does not turnwith the plug in the movements of the latter under the infiuence of theordinary key 26. As seen in Fig. 3, the cylinder has an auxiliaryspringpressed tumbler pin 31 that cooperates with a pin 32 whichprojects into the keyway 25. Under ordinary circumstances, and as shownin Fig. 3, the tumbler pin 31 projects across the line of meetingbetween the exterior of the sleeve 30 and the interior of the cylinder21, and consequently. even though the plug 18 is turned, the arm 29 willbe prevented from moving. However, if a special key 33 is inserted intothe keyway, as shown in Fig. 2, it will lift the tumbler pins 31 and 32and cause the latter to bridge the line of division between the interiorof the sleeve 30 and the exterior of the plug 18, and now, if the key isturned, the plug and sleeve 30 will turn with it so as to move the arm29 out of register with the recess 28, and out of engagement with thehook 27, and then, if the key is pulled forwardly, the removable section22 of the lock will be detached with the section 10.

I As best shown in Fig. 4, when the parts are assembled. the sleeve 30slips on to the rear end oi the plug 18. and the lug 15 passes through aslot in the disk 16. lhe disk is of the same diameter as the diameter ofthe sleeve 30. and consequently, the screws 17 which engage the plug 18act to prevent the sleeve 30 and its arm 29 from detaching from theplug.

it is preferred to provide the permanent section of the lock with a leafspring 36 which bears upon the disk 11 and functions to yieldingly holdthat disk in fixed position after the detachable section 22 has beenremoved. Therefore. when a new detachable section is inserted into thedoor. the groove 14 of the disk 11 will be in proper position toregister with the lug 153. This also facilitated by a stop pin 37 on therear end of the cylinder 21, which acts to limit the movement of the arm29 in one direction.

From the toregoingit is believed that the construction, operation andadvantages of the invention may be readily understood, and it isapparent that changes may be made in the details disclosed.withoutdeparting from the spirit of the invention. as expres ed in theclaims.

hat is claimed and desired to be secured by Letters Patent is: I

1. A pin tumbler door lock comprising a removably securable sectioncontaining a key operated plug. an axially aligned retaining sectioncontaining a rollback operatively engageable by said plug, and keyoperated locking means adapted to normally secure said sectionstogether.

2. A pin tumble? door lock comprising a removably securable sectioncontaining a key operated plug, an axially aligned retaining sectioncontaining a rollback operatively engageable by said plug, and keyoperated locking means adapted to normally secure said sectionstogether, said section locking means comprising a hook on one of saidsections and an arm on the other section engageable with said hook.

3. A pin tumbler door lock comprising a removably securable sectioncontaining a key operated plug, an axially aligned retaining sectioncontaining a rollback operatively engageahle by said plug, and keyoperated locking means adapted to normally secure said sectionstogether. said section locking means comprising a hook on the retainingsection and an arm en gageable with the hook and car ried bysaidrcmovably securable section.

4. A pin tumb er door lock comprising a reinovably securable sectioncarrying a key operated plug, a sleeve in which the plug may rotate. anarm carried by the sleeve, pin tumbler means normally preventingrotation of the sleeve with the plug and adapted to be operated by a keyto permit the sleeve to turn 'ith the plug, an axially aligned retainingsection carrying a rollback. interlocking means opcratively connectingthe plug to the rollback and adapted to be disengaged when the removablesection is detached from the retainin section, and means on theretaining section engagea -e with said arm for normally holding theremovable section in engagement with the retaining section.

5. A pin tumbler door lock comprising a removably securable sectioncarrying a key operated plug, a sleeve in which the plug may rotate,anarm carried by the sleeve, pin tumbler means normally preventingrotation of the sleeve with the plug and adapted to be optated by a keyto permit the sleeve to turn with the plug, an axially aligned retainingsection carrying rollback, interlocking means operatively connecting theplug to the rollback and adapted to be disengaged when the removablesection is detached from the retaining section, means on the retainingsection engageable with said arm for normally holding the removablesection in engagement with the retaining section, and yielding meanscooperating with the rollback for temporarily holdin the latter in afixed position to insure inter-engagement of said interlocking means.

6. A pin tumbler door lock comprising a removably securable sectioncarrying a key operated plug. a sleeve in which the plug may rotate. anarm carried by the sleeve, pin tumbler means normally preventingrotation of the sleeve with the plug and adapted to be operated by a keyto permit the s eeve to turn with the plug, an axially aligned retainingsectioncarryingarollback,interlockin means operatively connecting theplug to t e rollback and adapted to be disen aged when the removablesection is detached from the retaining section, means on the retainingsection engageable with said arm for normally holding the removablesection in engagement with the retaining section, yielding meanscooperating with the rollback for temporarily holding the latter in afixed position to insure interengagement of said interlocking means, andmeans on the removable section for limiting the turning movement of saidarm.

7 In a lock of the character described, a rotatable ke operated lughaving a keyway extending tl ierethroug a rollback actuated by saidplug, a sleeve surrounding a portion of the plug, pin tumbler meansnorma 1 preventing rotation of the sleeve with said plug and adapted tobe operated by a key inserted through the keyway for causing the sleeveto rotate with the plug, a lug for actuating the rollback projectingfrom the rear end of the plug, a slotted disk through which the lugextends, said disk removably securing the s eeve to the plug, meansdetachablyconnecting the disk to the plug, and an auxiliary lockingfinger carried by the sleeve.

In testimony whereof I aifix my signature.

' ARTHUR G. LYONS.

